<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        section{
            display: flex;
            width: 60%;
            height: 150px;
            background-color: pink;
            margin: 0 auto;
        }
        section div:nth-child(1){
          width: 100px;
          height: 150px;
          background-color: red;  
        }
        section div:nth-child(2){
             flex:1;
             background-color: green;
        }
        section div:nth-child(3){
          width: 100px;
          height: 150px;
          background-color: blue;  
        }
        p{
            display: flex;
            width: 60%;
            height: 150px;
            background-color: pink;
            margin:100px auto;
        }
        p span{
            flex:1
        }
        p span:nth-child(2){
           flex: 2;
           background-color:blue;
        }
    </style>
</head>
<body>
    <section>
        <div></div>
        <div></div>
        <div></div>
    </section>
    <p>
        <span>1</span>
        <span>2</span>
        <span>3</span>
    </p>
</body>
</html>